Strand: Algebra
Keywords: 2=1 proof solve conjecture fallacy reasoning
Topic: Proof
Level: 8a
Description: This resource is to help introduce the idea of a fallacy in proof, and to get students to build their understanding of algebraic reasoning. Cut out the proof into stages and give to students as an ordering activity. Once they have completed the proof ask "Do you agree with this?". Develop to reveal the fallacy in dividing by zero (because a=b). Great fun, but can be scary for students with low confidence!